Browsing by Author "Ertunç, Özgür"
Now showing items 1-20 of 21
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Active-grid turbulence effect on the topology and the flame location of a lean premixed combustion
Alhumairi, Mohammed; Ertunç, Özgür (Society of Thermal Engineers of Serbia, 2018)Lean premixed combustion under the influence of active-grid turbulence was computationally investigated, and the results were compared with experimental data. The experiments were carried out to generate a premixed flame ... -
Characterization of turbulence generated by an active grid with individually controllable paddles
Skeledzic, T.; Krauss, J.; Lienhart, H.; Ertunç, Özgür; Jovanovic, J. (Springer, 2018)An active grid with individually controllable paddles was constructed to generate strong turbulence (Reλ>200). Measurements of turbulence quantities using the hot-wire technique were conducted in a wind tunnel along the ... -
A Complete procedure for predicting and improving the performance of HAWT's
Al-Abadi, A.; Ertunç, Özgür; Sittig, F.; Delgado, A. (IOP Publishing, 2014)A complete procedure for predicting and improving the performance of the horizontal axis wind turbine (HAWT) has been developed. The first process is predicting the power extracted by the turbine and the derived rotor ... -
A design and optimization method for matching the torque of the wind turbines
Al-Abadi, A.; Ertunç, Özgür; Weber, H.; Delgado, A. (AIP Publishing, 2015)An aerodynamic shape optimization method for a horizontal axis wind turbine is developed and verified through experimentation with a laboratory-scale wind turbine. Our method is based on matching the rotor's and the coupled ... -
Determining thermal comfort in built environment using computational fluid dynamics simulations
Fidan, Güven (2017-06)In this thesis, three-dimensional time-dependent Thermal Comfort (TC) conditions in an occupied room is investigated and determined. The room is considered with furniture of varying materials (i.e. steel, wood, etc.) and ... -
Effect of pH on particle agglomeration and radiative transfer in nanoparticle suspensions
Al-Gebory, Layth Wadhah Ismael (2018-08)Nanoparticle suspensions (NPSs) are solid-fluid mixtures where small dielectric or metallic particles (with sizes <100 nm) used in a base fluid. NPSs have unique and tunable thermo-optical properties, and for that reason ... -
Effects of turbulence intensity and length scale on the flame location of premixed turbulent combustion in a diffuser combustor
Nazzal, Ibrahim Thamer; Ertunç, Özgür (J-STAGE, 2017)This study focused on the dependency of the flame location of a premixed propane-air flame on turbulence intensity and length scale. The flame location was investigated using a diffuser-type combustor to show the response ... -
Experimental investigation of droplet impact on moving surfaces
Kayansalçık, Gökhan (2018-01)Droplet impact on moving surfaces has been studied experimentally by using high-speed photography technique. Fluid properties (droplet diameter and velocity), surface properties (wettability and roughness) and surface ... -
From passive to active pitch regulation of wind turbines: Optimization method with numerical validation
Al-Abadi, A.; Kim, Y.; Park, J.-Y.; Kang, H.; Ertunç, Özgür; Delgado, A. (ASME, 2015)An optimization method that changes the control strategy of the Horizontal Axis Wind Turbine (HAWT) from passive- to active-pitch has been developed. The method aims to keep the rated power constant by adjusting the blade ... -
High-speed visualization of acoustically excited cavitation bubbles in a cluster near a rigid boundary
Vaidya, H. A.; Ertunç, Özgür; Lichtenegger, T.; Hachmann, J.; Delgado, A.; Skupin, A. (Springer Berlin Heidelberg, 2017)In the present work, high-speed visualizations at one million frames/s have been used to study the oscillation characteristics of acoustic cavitation bubbles. The bubbles are generated by acoustic cavitation using an ... -
Interaction between free-stream turbulence and tip-vortices of wind turbine blades with and without winglets
Al-Abadi, A.; Kim, Y.; Ertunç, Özgür; Epple, P.; Delgado, A. (IOP Publishing, 2018)Experimental investigations of the free-stream turbulence impact on the tip-vortices generated in wind turbine blades have been performed. The investigation is done by exposing an efficient laboratory scale wind turbine ... -
Investigation of flame characteristics in a turbulent premixed combustion
Alhumairi, Mohammed Khudhair Abbas (2018-10)In this thesis, the turbulent flame closure (TFC) model and coherent flame model (CFM) of turbulent premixed flames as steady state flow are used. In addition, large eddy simulation (LES) model as unsteady state flow is ... -
Meso-scale cooling devices experimental and numerical heat transfer analysis
Parsa, Shadi Habibi (2017-01)Various thermal management strategies and related technologies are recently developed based on the specific needs, which they are designed to fulfill. Some of these technologies are muffin fans, synthetic jets, and ... -
Numerical and experimental analysis of impinging synthetic jets for cooling a point-like heat source
Glowienko, G.; Derlien, H.; Ertunç, Özgür; Delgado, A. (ASME, 2018-05-01)High power light emitting diodes (LEDs) being used for low and high beam in automotive lighting need active cooling of their heat sinks by radial or axial fans. But the moving elements of the fan cause abrasion, noise, and ... -
The penetration of acoustic cavitation bubbles into micrometer-scale cavities
Vaidya, H. A.; Ertunç, Özgür; Lichtenegger, T.; Delgado, A.; Skupin, A. (Elsevier, 2016)The penetration of acoustically induced cavitation bubbles in micrometer-scale cavities is investigated experimentally by means of high-speed photography and acoustic measurements. Micrometer-scale cavities of different ... -
Simulations of droplet impacts on hydrophobic moving walls
Heidarifatasmi, Hosein (2017-08)Numerical simulations of water drop impact onto hydrophobic surfaces (Wax, Teflon) are carried out through usage of Eulerian multiphase model. Volume of fluid (VOF) model is used to capture the deformation of the water ... -
Structural and flow relationship of microfluidics pulsating high and low frequency jets
İkhlaq, Muhammad (2015-06)Synthetic jets are being investigated last several years. Researchers have been interested in its unique applications for a wide range of flow control to thermal management of electronics applications. Synthetic jets are ... -
Thermal and radiative energy/exergy analyses of parabolic trough collector systems
Mohammed, Hayder Noori (2018-08)The concept of exergy is used to determine the maximum energy that can be extracted from a system. It is based on both the first and the second laws of thermodynamics and allows us to determine the irreversibilities ... -
A torque matched aerodynamic performance analysis method for the horizontal axis wind turbines
Al-Abadi, A.; Ertunç, Özgür; Weber, H.; Delgado, A. (Wiley, 2013-11)An analysis method is developed to test the operational performance of a horizontal axis wind turbines. The rotor is constrained to the torque–speed characteristic of the coupled generator. Therefore, the operational ... -
Turbulence and flame interaction for control of flame location in diffuser combustor
Nazzal, Ibrahim Thamer Nazzal (2018-08)Achieving an appropriate flame location is desirable in many combustion system applications especial in the design of the combustion system. Given that the characteristics of turbulent flows influence flame behavior and ...
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